Due to high demand, current lead time on tunes is minimium of 2 weeks. Current lead times on custom built turbos is ~1 month. All PT Wiring Solutions products have an additional 5 day lead time after order processing. Please plan accordingly. We thank you for your support of the finest parts available for the 6.5L Turbo diesel platform!

Turbomaster Wastegate Controllers

Quadstar Tuning LLC

  • $119.00

Delete your vacuum pump and gain the reliability you need for your 6.5L with genuine Turbo Masters!. Also known as a mechanical boost or wastegate controller.

Typical variants include include the following but please ask if you are unsure because turbos are typically swapped from the OEM configuration:

 1991-1995 6.5L Truck : GM3 or GM4 Turbo

1996-2000 6.5L Truck : GM5 or GM8 Turbo

1994+ H1 Hummer or Van : GM6 or GM7 Turbo

Tuning is required to gain full benefits and prevent trouble codes with de-fueling. Contact us for options!

A boost gauge is required with this product so you can set/monitor you boost levels.  Order the boost bolt separately as a bolt-on way to add a boost gauge to stock intake plenums.

When removing the vacuum pump completely, you will need to use a shorter serpentine belt. General information is as follows:

  • 1994-1995: 101" - 101.5" Belt
  • 1996+: 99.5" or 100" Belt
  • Generally speaking they are ~1" shorter then the stock belt


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